Claims
- 1. An acrylic rubber obtained by copolymerizing a monomer mixture of:
- (A) 70 to 99.99% by weight of at least one compound selected from the group consisting of alkyl acrylates and alkoxyalkyl acrylates,
- (B) 0.01 to 10% by weight of at least one compound represented by the general formula: ##STR11## wherein R.sup.1 is a hydrogen atom or a methyl group; X is a hydrogen atom, --COOR.sup.6 (R.sup.6 is an alkyl group having 1-10 carbon atoms or an alkoxyalkyl group having 2-14 carbon atoms), or ##STR12## R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen atoms or groups having 1-10 carbon atoms whose carbon atom adjacent to C.dbd.C has no hydrogen; R.sup.5 is a group having 1-10 carbon atoms whose carbon atom adjacent to C.dbd.C has no hydrogen; Y is ##STR13## or --O--; and n is 1 or 0, and (C) 0-20% by weight of at least one other compound selected from the group consisting of vinyl compound, vinylidene compound and vinylene compound,
- in the presence of a radical polymerization initiator.
- 2. The acrylic rubber according to claim 1, wherein the component (A) is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, dodecyl acrylate, cyanoethyl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, butoxyethyl acrylate and ethoxypropyl acrylate.
- 3. The acrylic rubber according to claim 1, wherein the component (A) is used in a proportion of 80-99.90% by weight.
- 4. The acrylic rubber according to claim 1, wherein the component (B) is at least one compound represented by the general formula: ##STR14## wherein R.sup.1, R.sup.4, R.sup.5 and Y have the same meanings as defined in claim 1, and X.sup.1 is a hydrogen atom, --COOR.sup.6 (R.sup.6 has the same meaning as defined in claim 1), --Y--CH.dbd.CH--R.sup.4 or --Y--R.sup.5 --CH.dbd.CH--R.sup.4.
- 5. The acrylic rubber according to claim 1, wherein the component (B) is at least one compound selected from the group consisting of vinyl methacrylate, vinyl acrylate, 1,1-dimethylpropenyl methacrylate, 1,1-dimethylpropenyl acrylate, 3,3-dimethylbutenyl methacrylate, 3,3-dimethylbutenyl acrylate, divinyl itaconate, divinyl maleate, divinyl fumarate, vinyl 1,1-dimethylpropenyl ether, vinyl 3,3-dimethylbutenyl ether, 1-acryloyloxy-1-phenylethene, 1-acryloyloxy-2-phenylethene, 1-methacryloyloxy-1-phenylethene and 1-methacryloyloxy-2-phenylethene.
- 6. The acrylic rubber according to claim 1, wherein the component (B) is vinyl methacrylate or vinyl acrylate.
- 7. The acrylic rubber according to claim 1, wherein the component (B) is used in a proportion 0.1-5% by weight.
- 8. The acrylic rubber according to claim 1, wherein the component (C) is at least one compound selected from the group consisting of styrene, vinyltoluene, alphamethylstyrene, vinylnaphthalene, halogenated styrenes, acrylonitrile, methacrylonitrile, acrylamide, N-methylolacrylamide, vinyl acetate, vinyl chloride, vinylidene chloride, divinylbenzene, cyclohexyl acrylate, benzyl acrylate, ethylene glycol dimethacrylate, methacrylic acid, itaconic acid, fumaric acid and maleic acid and is used in a proportion of 0.01-20% by weight.
- 9. The acrylic rubber according to claim 1, wherein the radical polymerization initiator is a peroxide or an azo compound.
- 10. The acrylic rubber according to claim 9, wherein the radical polymerization initiator is used in a proportion of 0.001-1.0% by weight based on the weight of the monomer mixture.
- 11. The acrylic rubber according to claim 10, wherein the polymerization is conducted at 0.degree.-80.degree. C. for 0.01-30 hours.
- 12. An acrylic rubber composition essentially comprising the acrylic rubber of claim 1 and a crosslinking agent.
- 13. The acrylic rubber composition according to claim 12, wherein the crosslinking agent is sulfur, a sulfur-containing organic compound, an organic peroxide, a resin, a quinone derivative, a polyhalide, a bis(dioxotriazoline) derivative, an aldehyde, an epoxy compound, an amine-borane complex or a dipolar compound.
- 14. The acrylic rubber composition according to claim 12, wherein the crosslinking agent is sulfur, a sulfur-containing organic compound or an organic peroxide.
- 15. The acrylic rubber composition according to claim 12, wherein the crosslinking agent is an organic peroxide.
- 16. The acrylic rubber composition according to claim 12, wherein the crosslinking agent is used in a proportion of 0.1-20 parts by weight per 100 parts by weight of the acrylic rubber.
- 17. The acrylic rubber composition according to claim 12, which further comprises a crosslinking co-agent.
- 18. The acrylic rubber composition according to claim 17, wherein the crosslinking co-agent is contained in a proportion of 1-10 parts by weight per 100 parts by weight of the acrylic rubber.
- 19. The acrylic rubber composition according to claim 13, which further comprises conventional compounding agents other than the crosslinking agent.
- 20. The acrylic rubber composition according to claim 13, which further comprises a polymer which can be crosslinked with the same crosslinking agent.
- 21. The acrylic rubber composition according to claim 20, wherein the polymer is at least one member selected from the group consisting of an ethylene-propylene rubber, an acrylonitrile-butadiene rubber, an epichlorohydrin rubber, an isoprene rubber, natural rubber, a styrene-butadiene rubber, a butadiene rubber, a fluororubber, a chloroprene rubber and other acrylic rubbers.
- 22. A cured article of the acrylic rubber composition of claim 13.
- 23. The cured article according to claim 22, which is in the form of a hose.
- 24. The cured article according to claim 22, which is in the form of a sealing material.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-73612 |
Mar 1987 |
JPX |
|
62-279393 |
Nov 1987 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This is an application of continuation-in-part of application Ser. No. 07/173,578 filed Mar. 25, 1988, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4228265 |
Ohishi et al. |
Oct 1986 |
|
4248985 |
Ohishi et al. |
Feb 1981 |
|
Foreign Referenced Citations (6)
Number |
Date |
Country |
54-127494 |
Oct 1979 |
JPX |
60-084310 |
May 1985 |
JPX |
61-044909 |
Mar 1986 |
JPX |
61-44909 |
Apr 1986 |
JPX |
61-057843 |
Dec 1986 |
JPX |
62-64809 |
Mar 1987 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
173578 |
Mar 1988 |
|